Surfboard fin plug



FIG. 1 is an upper perspective view of a surfboard fin plug showing our new design in accordance with the invention;

FIG. 2 is a lower perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front end view thereof; and,

FIG. 6 is a side view thereof.

Portions of the drawings shown in phantom form no part of claimed design. 

The ornamental design for a surfboard fin plug, as shown and described. 